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Differential Evolution and Neofunctionalization of Snake Venom Metalloprotease Domains

Brust, A., Sunagar, K., Undheim, E. A. B., Vetter, I., Yang, D. C., Casewell, Nicholas ORCID:, Jackson, T. N. W., Koludarov, I., Alewood, P. F., Hodgson, W. C., Lewis, R. J., King, G. F., Antunes, A., Hendrikx, I. and Fry, B. G. (2013) 'Differential Evolution and Neofunctionalization of Snake Venom Metalloprotease Domains'. Molecular & Cellular Proteomics, Vol 12, Issue 3, pp. 651-663.

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Snake venom metalloproteases (SVMP) are composed of five domains: signal peptide, propeptide, metalloprotease, disintegrin, and cysteine-rich. Secreted toxins are typically combinatorial variations of the latter three domains. The SVMP-encoding genes of Psammophis mossambicus venom are unique in containing only the signal and propeptide domains. We show that the Psammophis SVMP propeptide evolves rapidly and is subject to a high degree of positive selection. Unlike Psammophis, some species of Echis express both the typical multidomain and the unusual monodomain (propeptide only) SVMP, with the result that a lower level of variation is exerted upon the latter. We showed that most mutations in the multidomain Echis SVMP occurred in the protease domain responsible for proteolytic and hemorrhagic activities. The cysteine-rich and disintegrin-like domains, which are putatively responsible for making the P-III SVMPs more potent than the P-I and P-II forms, accumulate the remaining variation. Thus, the binding sites on the molecule's surface are evolving rapidly whereas the core remains relatively conserved. Bioassays conducted on two post-translationally cleaved novel proline-rich peptides from the P. mossambicus propeptide domain showed them to have been neofunctionalized for specific inhibition of mammalian a7 neuronal nicotinic acetylcholine receptors. We show that the proline rich postsynaptic specific neurotoxic peptides from Azemiops feae are the result of convergent evolution within the precursor region of the C-type natriuretic peptide instead of the SVMP. The results of this study reinforce the value of studying obscure venoms for biodiscovery of novel investigational ligands.

Item Type: Article
Subjects: QU Biochemistry > Genetics > QU 460 Genomics. Proteomics
QU Biochemistry > Proteins. Amino Acids. Peptides > QU 68 Peptides
QV Pharmacology > Toxicology > General Toxicology > QV 600 General works
WD Disorders of Systemic, Metabolic or Environmental Origin, etc > Animal Poisons > WD 410 Reptiles
Faculty: Department: Biological Sciences > Department of Tropical Disease Biology
Digital Object Identifer (DOI):
Depositing User: Lynn Roberts-Maloney
Date Deposited: 13 Feb 2015 11:41
Last Modified: 06 Feb 2018 13:08


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